Merge pull request #9933 from pennae/debugger-fix

fix debugger crashing while printing envs

(cherry picked from commit 9b8b4860913afdb7f9cb1e1e81f9a9dd192cd1c1)
Change-Id: Ica6a17e4b3e3b8b8093719f442c28be7f13be09d

.gitignore

@@ -92,6 +92,7 @@ perl/Makefile.config
 /tests/functional/ca/config.nix
 /tests/functional/dyn-drv/config.nix
 /tests/functional/repl-result-out
+/tests/functional/debugger-test-out
 /tests/functional/test-libstoreconsumer/test-libstoreconsumer
 
 # /tests/functional/lang/

src/libexpr/eval.cc

@@ -810,7 +810,8 @@ void printEnvBindings(const SymbolTable & st, const StaticEnv & se, const Env &
     if (se.up && env.up) {
         std::cout << "static: ";
         printStaticEnvBindings(st, se);
-        printWithBindings(st, env);
+        if (se.isWith)
+            printWithBindings(st, env);
         std::cout << std::endl;
         printEnvBindings(st, *se.up, *env.up, ++lvl);
     } else {
@@ -822,7 +823,8 @@ void printEnvBindings(const SymbolTable & st, const StaticEnv & se, const Env &
                 std::cout << st[i.first] << " ";
         std::cout << ANSI_NORMAL;
         std::cout << std::endl;
-        printWithBindings(st, env);  // probably nothing there for the top level.
+        if (se.isWith)
+            printWithBindings(st, env);  // probably nothing there for the top level.
         std::cout << std::endl;
 
     }
@@ -844,7 +846,7 @@ void mapStaticEnvBindings(const SymbolTable & st, const StaticEnv & se, const En
     if (env.up && se.up) {
         mapStaticEnvBindings(st, *se.up, *env.up, vm);
 
-        if (!env.values[0]->isThunk()) {
+        if (se.isWith && !env.values[0]->isThunk()) {
             // add 'with' bindings.
             Bindings::iterator j = env.values[0]->attrs->begin();
             while (j != env.values[0]->attrs->end()) {

tests/functional/debugger.sh

@@ -0,0 +1,13 @@
+source common.sh
+
+clearStore
+
+# regression #9932
+echo ":env" | expect 1 nix eval --debugger --expr '(_: throw "oh snap") 42'
+echo ":env" | expect 1 nix eval --debugger --expr '
+  let x.a = 1; in
+  with x;
+  (_: builtins.seq x.a (throw "oh snap")) x.a
+' >debugger-test-out
+grep -P 'with: .*a' debugger-test-out
+grep -P 'static: .*x' debugger-test-out

tests/functional/local.mk

@@ -122,7 +122,8 @@ nix_tests = \
   path-from-hash-part.sh \
   toString-path.sh \
   read-only-store.sh \
-  nested-sandboxing.sh
+  nested-sandboxing.sh \
+  debugger.sh
 
 ifeq ($(HAVE_LIBCPUID), 1)
 	nix_tests += compute-levels.sh